nelson mandela said education is the most powerful weapon you can use to change the world. but in afghanistan right now the taliban have destroyed hundreds of schools, especially targeting ones that are educating young women and young girls. our next hero has refused to back down, welcoming girls inside the protective walls of the school that she herself built. to tell us about her, please welcome a proud supporter of the segway institute for learning in her hometown of central falls, rhode island, viola davis. >> let's remember this number -- 32 million. that's how many girls around the world are deprived of a primary school education every day. for too many, they are denied this right simply because they are girls. not allowed to learn how to read and write, add and subtract, understand science and the stars. 32 million brilliant girls told they can't reach for the heavens. that's why razia jan, a woman who embodies the word "courage" says, not on my watch. we're going to change this. and after she saw the towers fall on 9/11, she did just that. she returned to afghanista